Concrete floor construction.



RFS. CHEW. CONCRETE FLOOR CONSTRUCTION.

APPLICATION FILED mac. 2, 1911.

1,054,338. Patented Feb. 25, 1913.

I J n El 7207' 67a UNITED STATES PATENT OFFICE.

RICHARD S. CHEW, OF OAKLAND, CALIFORNIA.

CONCRETE FLOOR CONSTRUCTION.

Specification of Letters Patent. Application filed December'2, 1911. Serial No. 665L516.

To all whom it may concern Be'it known that I, RICHARD S. Cnnw, a citizen of the .United States, residin at Oakland, in the county of Alameda and tate of California, have invented new and useful Improvements in Concrete Floor Construction, of which the following is a specification.

This invention relates to eoncrete floor construction, and particularly pertains to a skeleton frame.for concrete floors, roof, ceilings and the like.

-It is the object of this invention to provide a skeleton frame for reinforcing and livers in supporting a concrete slab; and to produce a floor in which the loads will be transmitted from the slab tothe girders in substantially aradial direction.

Another object is to provide a frame for reinforcing and supporting concrete slabs, which is slmple in construction, economical, and which can be easily and quickly, assembled. i

, Further objects of this invention, together with the advantages derived by the use of same, will be made apparent in the following specification.

The invention consists of the parts and the construction and combination of parts as hereinafter more fully described and claimed, having reference to the accompanying drawings, in whieh igure 1 is a plan view of the skeleton frame, with parts broken away. Fig. 2 is a detail section 'on the line XX, Fig. 1.

Fig. 3 is a detail section on the line YY, Fig. 1.

' In the drawings, A represents vertically disposed posts or columns of any suitable description, here shown as arranged at the four corners of'a rectangle, and B indicates horizontal girders extending between the columns A and secured thereto in any desired manner. The irders B are here shown as formed of-I- earns, but any other form may be em loyed.

The columns and girders Bare those commonly employed in steel frame building Patented Feb.'25,19 13. f

construction, for supporting the outside walls, inside partitions, floors, etc.

The essence of this invention resides in the manner of constructing and supporting a concrete floor on the girders B, which is accomplished by first placing diagonally-arranged suppqrting beams 2 across the corners of the rectangle formed by the irders B; the top of the beam 2 lying flush withthe top of the girders B. When in position, the

beams 2 and girders B form an octagonal,

horizontally disposed frame, as shown in Fig. 1, across which is placed ';a light reinforcement, indicated at 3, which may consist of a wire nettin or similar construction, the

strands'of whic run at right angles to the girders B. The reinforcement 3 rests upon' +the octagon frame and suspends therefrom in the shape of an approximate catenary curve of revolution.

the reinforcement 3 is a series of rods 4, or equivalents, which extend transverse of the Mounted on the girders B and resting on i girders and are supported at their middle, 7 so as to xtend'some distance on each side of the irders, as shown in Figsfl and. 2. The re s 4 may be spaced at any suitable distance apart and are arranged on the girders 'B between the ends of the diagonal beams 2. i A

A series of rods '5 aredispo'sed'upo'n the diagonal beams 2, at right angles thereto,

with their ends projectmg'some distance beyond the outer faces of the beams; The

rods 5 are of such length that they will e tend across the pair of parallel beams 2 on the op osite sides of the columns A; the two sets 0 rods 5 on the two pairs of beams 2 surrounding a column A, crossing each other at right angles, as shown in Fig. '1, and the ends of the outermost rods 5 in the series overlapping the outermost rods 4 on the girders B.

When the reinforcement 3 and the members 4-5 are and as shown in Fig. -1, the concrete 6, or

ositioned as just described, I

other plastic material of which the floor is to be formed, is molded thereon in any suitable manner, so asto embed the relnforcement 3 and the bars, 4-5 therein; the gird ers B and the diagonal supports 2 being alsoincased in the concrete body. The upper surface of the slab thus, formed is'above the bars 45 on the'girder B and beams 2,

while the bottom of the slab" is a'little befigure.

posed of the girders B may be of any desired sided frame by the employment of diagonal members 2, to form the inner face of a embedding the irders, beams, cantalivers mnstruction, comprising a frame formed of low the IUWQIll'lOSt point of the catenated reinforcement 3.

From the foregoing it will be seen that the flat slab extending between the columns A is carried on a practically circular support, as indicated by the dotted line a in Fig. 1'. The slab thus virtually becomes a circular. slab with its periphery supported and fixed on the girders B and the beams 2; the rods t and 5 in conjunction with concrete forming cantalivers, the outer ends of which extend into the periphery of the circular slab, thereby binding and fixing the slab in relation to its supports. By this arrangementthe loads imposed on the slab are transmitted to an annular support, thus permitting the slab to be constructed lighter and with less reinforcement than is possible with a rectangular support, as is now "commonly employed; analysis showing that a circular slab supported at its periphery is approximately 30% stronger than a rectangular slab of the same diameter supported on its four sides. By the arrangement of the bars 4-5,. here shown, short lengths of bars'may be used, thus obviating the use of long rods extending from girder to girder in the form of beams. This arrangement also facilitates and cheapens construction, as it does not require speciallyformed members nor skilled labor to place the several members in-position.

A desirable feature of this invention is the facility with which the structure may be analyzed, and the bearing capacity computed, afeature made possible by the cantaliveraction of the reinforcing bars 4 5, and the circular support. I v

While I have described the members 45 as bars, it is manifest that wires, cables, mesh or analogous structures may be employed, if desired, and that the frame comoutline other than rectangular; the essential feature being to double the sides of a many the frame as near on a circular or elliptical line as possible. ,It is also obvious that the diagonal members 2 may be curved, if desired, so as to convert the frame from a four sided figure into a circular-=01 near circular Having thus described my invention, what I' cl'aim and desire to secure by Letters Patent isv ifA skeleton support for concrete floor horizontal girders arranged in rectangles and beams extending diagonally across the on and projecting on each side ofthe beams and girders having their ends terminating a relatively short distance from the beams and girders, whereby a wide 0 en space is formed of approximately circu ar formation, and a plastic material embodying the girders, beams and cantalivers, andforming-a slab which spans said space.

2. A skeleton support for concrete floor construction, comprising a frame formed of horizontal girders arranged in rectangles and beams extendingdiagonally across the corners of the rectangles with their top surfaces substantially flu'sh with the upper surfaces of the girders,cantalivers supported on said beams and girders and extending at rightangles thereto, and a catenated reinforcement extending across the frame beneath the cantalivers, said cantali'vers being formed of transverse rods resting on and projecting on each side of thebeams and girders, said rods having their ends termi-- natinga relatively short distance from said beams and girders whereby a wide open spaceis formed of approximately circular formation over which the catenated reinforce, extends. 3, A. floor construction comprising the combination of a frame formed of horizontal girders arranged in rectangles and beams extending diagonall across the corners of the rectangles with teir top surfaces substantially. flush with theupper surfaces of the girders, cantalivers supported on said beams and girders and extending at right angles. thereto, said cantalive'rs-formed of spaced rods resting on and projecting on each side of the beams and girders and terminating a short distance therefrom, a catenated reinforcement extending across the frame beheath the cantalivers, and a plastic material RICHARD s. CHEW.

Witnesses JOHN H. HERRING, FRANcns V. Conn. 

